Add API surface to Kinoko so that it can be used by external callers

[ElectrifiedStrawberry]

Discussed a little bit on Discord here: https://discord.com/channels/214574342137315328/1047962335286919260/1237788120297111777

Essentially the idea being is that you'd be able to link via some API to Kinoko then step through the game and get parts of the game state.

For example a naive frontend implementation (again not hung up on specifics or even a lot of the generalities but this is a extremely rough sketch of my idea for thinking about it for 3 seconds) would be something like

Kinoko* k = /* ... */
do {
  k->doFrameStep();
  graphics.updatePos(k->/* ... */);
  waitABit();
} while (!k.raceIsFinished());

Related somewhat to #63.

[vabold]

This is, at the moment, a long-distance goal. I will adjust the priority accordingly when we reach this point.